Płock Land
Płock Land was a land of the Kingdom of Poland until 1495, and later, part of the Płock Voivodeship, Crown of the Kingdom of Poland, Polish–Lithuanian Commonwealth, from 1495 to 25 September 1793. The seat of its government was located in Płock.
Subdivisions
The land was divided into five counties. They were:Sierpc County was formed in the 1530s, from the portion of the Bielsk County.